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epa06188876 Kaia Kanepi of Estonia reacts during a changeover as she plays Madison Keys of the US during their US Open Tennis Championships quarterfinals round match at the USTA National Tennis Center in Flushing Meadows, New York, USA, 06 September 2017. The US Open runs through September 10. EPA/JOHN G. MABANGLO *** Local Caption *** 53000073